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	<title>Document</title>
	<style type="text/css">
		.teshu{
			color: red;
		}
		.zhongyao{
			text-decoration: underline;
		}
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<body>
	<h3 class="zhongyao">我是一个h3啊</h3>
	<h3 class="teshu zhongyao">我是一个h3啊</h3>
	<h3>我是一个h3啊</h3>
	<p>我是一个段落啊</p>
	<p class="teshu">我是一个段落啊</p>
	<p class="teshu">我是一个段落啊</p>
</body>
</html>